A sales manager for an advertising agency believes there is a relationship between the number of contacts and the amount of the sales.To verify this belief,the following data was collected: 
The 95% prediction interval for a particular person making 30 calls is
Definitions:
Independent
A term in statistics that describes two or more variables which do not influence or affect each other.
Independent
Not influenced by or connected to others; in statistics, it often implies that variables are not correlated.
Independent
Not influenced or controlled by others; capable of thinking or acting for oneself.
Standard Deviations
A statistical measure indicating the dispersion or spread of a set of numbers from their mean; it shows how much variation there is from the average.
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